Audio Communication Line Inspection

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect audio unit connector and display unit connector.
3. Check continuity between audio unit and display unit.
  
  Fig 1: Terminal Continuity Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between Audio Unit And Display Unit
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display unit and ground.
  
  Fig 3: Terminal Continuity Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 2.
2. NG : Repair harness or connector.
CHECK AUDIO COMMUNICATION SIGNAL(DSP-AUD)
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M62 terminal 8 (LG) and ground.
  1. Approx. 3.5V or more
OK or NG
1. OK : GO TO 3.
2. NG : Replace display unit.
Fig 4: Checking Voltage Between Display Unit Harness Connector M62 Terminal 8 (LG) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUDIO COMMUNICATION SIGNAL(AUD-DSP)
1. Turn ignition switch OFF and connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M60 terminal 21 (B/Y) and ground.
  1. Approx. 3.5V or more
OK or NG
1. OK : GO TO 4.
2. NG : Replace audio unit.
Fig 5: Checking Voltage Between Audio Unit Harness Connector M60 Terminal 21 (B/Y) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUDIO COMMUNICATION SIGNAL(DSP-AUD)
1. Turn ignition switch ON.
2. Check the signal between display unit harness connector M62 terminal 8 (LG) and ground with CONSULT-II or oscilloscope.
Fig 6: Oscilloscope Graph Pattern
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Checking Signal Between Display Unit Harness Connector M62 Terminal 8
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 5.
2. NG : Replace display unit.
CHECK AUDIO COMMUNICATION SIGNAL(AUD-DSP)
1. Turn ignition switch ON.
2. Check the signal between display unit harness connector M62 terminal 10 (B/Y) and ground with CONSULT-II or oscilloscope.
Fig 8: Oscilloscope Graph Pattern
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 9: Checking Signal Between Display Unit Harness Connector M62 Terminal 10
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : INSPECTION END
2. NG : Replace audio unit.